Synthesis and Characterisation of 2,3a,5,6,7a-pentaacetoxy-octahydro-1H-indene from indan-2-ol

Synthesis of Anti–-anti (anti–-syn)-3,4:8,9-Tetraacetoxy-11-Oxa-Tricyclo [4.4.1.01,6]Undecanes

Synthesis of anti–-anti- and anti–-syn-3,4:8,9-tetraacetoxy-11-oxa-tricyclo[4.4.1.01,6] undecanes have been achieved starting from naphthalene. The Birch reduction of naphthalene gave 1,4,5,8-tetrahydro-naphthalene in high yield. 1,4,5,8-Tetrahydro-naphthalene was selectively oxidised with mCPBA to give 11-oxa-tricyclo[4.4.1.01,6]undeca-3,8-diene. OsO4 oxidation followed by acetylation furnished the corresponding tetraacetates.

A Novel and Stereospecific Synthesis of Aminocyclitol: N-Tosyldihydroconduramine E2

A stereospecific synthesis of N-tosyldihydroconduramine E2, a new aminocyclitol, has been synthesised starting from cyclohexa-1,3-diene. The photooxygenation of cyclohexa-1,3-diene afforded the bicyclic endoperoxide. Reduction of the endoperoxide with thiourea and then reaction of the bis-carbamate with p-TsNCO followed by a palladium-catalysed ionisation/cyclisation reaction, gave a vinyl oxazolidin-2-one. Oxidation of the double bond in the oxazolidin-2-one with KMnO4 followed by acetylation, gave the oxazolidinone-diacetates. Hydrolysis of the oxazolidinone ring and removal of the acetate groups gave the desired aminocyclitol, N-tosyldihydroconduramine E2.