1
|
Kobayashi K, Tsunomori Y, Nogi T, Hiyoshi H, Umezu K. A Facile Synthesis of 1,4-Dihydro-2H-pyrimido[4,5-d][1,3]oxazin-2-one Derivatives from 4,6-Dichloro-2-(methylsulfanyl)pyrimidine. HETEROCYCLES 2018. [DOI: 10.3987/com-18-13879] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
2
|
Kobayashi K, Ono R, Ishitobi K, Murayama I, Hiyoshi H, Umezu K. Synthesis of 6,7-Dihydro-5H-thiopyrano[2,3-d]pyrimidin-5-one Derivatives Starting with 4,6-Dichloro-2-(methylsulfanyl)pyrimidine. HETEROCYCLES 2018. [DOI: 10.3987/com-17-13840] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
3
|
Whitehead A, Zhang Y, McCabe Dunn J, Sherer EC, Lam YH, Stelmach J, Sun A, Shiroda M, Orr RK, Waddell ST, Raghavan S. Selective Formation of Functionalized α-Quaternary Malononitriles toward 5,5-Disubstituted Pyrrolopyrimidinones. Org Lett 2017; 19:4448-4451. [PMID: 28812897 DOI: 10.1021/acs.orglett.7b01930] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A modular, selective approach to complex α-tertiary substituted malononitriles is reported. The method takes advantage of β-ester-substituted α,α-dinitrile alkenes as highly reactive, chemoselective electrophiles for 1,4-additions with organometallic nucleophiles to produce functionally and sterically dense all-carbon quaternary centers. In the presence of a chiral ester auxiliary bearing an aromatic ring, the 1,4-addition occurs with good to excellent selectivity due to favorable cation-π interactions. The highly functionalized malononitriles represent versatile building blocks and can be applied toward efficient, highly selective syntheses of 5,5-disubstituted pyrrolopyrimidinones.
Collapse
Affiliation(s)
- Alan Whitehead
- Discovery Chemistry, Merck & Co., Inc. , 2000 Galloping Hill Road, Kenilworth, New Jersey 07033, United States
| | - Yong Zhang
- Discovery Chemistry, Merck & Co., Inc. , 2000 Galloping Hill Road, Kenilworth, New Jersey 07033, United States
| | | | | | | | - John Stelmach
- Discovery Chemistry, Merck & Co., Inc. , 2000 Galloping Hill Road, Kenilworth, New Jersey 07033, United States
| | - Aaron Sun
- Discovery Chemistry, Merck & Co., Inc. , 2000 Galloping Hill Road, Kenilworth, New Jersey 07033, United States
| | - Melisa Shiroda
- Discovery Chemistry, Merck & Co., Inc. , 2000 Galloping Hill Road, Kenilworth, New Jersey 07033, United States
| | | | - Sherman T Waddell
- Discovery Chemistry, Merck & Co., Inc. , 2000 Galloping Hill Road, Kenilworth, New Jersey 07033, United States
| | - Subharekha Raghavan
- Discovery Chemistry, Merck & Co., Inc. , 2000 Galloping Hill Road, Kenilworth, New Jersey 07033, United States
| |
Collapse
|
4
|
Kobayashi K, Nogi T, Tsunomori Y, Hiyoshi H, Umezu K. Synthesis of 8,9-Dihydropyrimido[4,5-e][1,4]oxazepin-7(5H)-ones by the Reaction of 1-(4-Chloropyrimidin-5-yl)alkan-1-ols with N-Alkylglycines. HETEROCYCLES 2017. [DOI: 10.3987/com-17-13795] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
5
|
Kobayashi K, Nozawa I, Utsumi H, Ueyama T, Hiyoshi H, Umezu K. Synthesis of 7,8-Dihydropyrido[2,3-d]pyrimidine Derivatives from 4,6-Dichloro-2-(methylsulfanyl)pyrimidine. HETEROCYCLES 2017. [DOI: 10.3987/com-17-13720] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|