A strategy for synthesis of conduritols and related cyclitols via stereodivergent vinylsilane-aldehyde cyclizations
摘要:
A novel stereospecific and stereodivergent cyclization of vinylsilane-aldehyde 10, derived from L-arabinose, has been used to prepare the scalemic protected conduritols 11 and 12.
A strategy for synthesis of conduritols and related cyclitols via stereodivergent vinylsilane-aldehyde cyclizations
摘要:
A novel stereospecific and stereodivergent cyclization of vinylsilane-aldehyde 10, derived from L-arabinose, has been used to prepare the scalemic protected conduritols 11 and 12.
An approach to total synthesis of (+)-lycoricidine
作者:Matthias C. McIntosh、Steven M. Weinreb
DOI:10.1021/jo00070a016
日期:1993.8
A convergent synthesis of a protected version of (+)-lycoricidine has been accomplished in 13 steps from L-arabinose. Preparation of the aminocyclitol moiety 50 employed a novel vinylsilane-terminated N-sulfonyliminium ion cyclization of vinylsilane aldehyde 42. Closure of the B-ring using an intramolecular Heck reaction afforded lycoricidine derivative 58. An unexpected cyclization of vinylsilane aldehyde 42 allowed for the stereodivergent preparation of semiprotected conduritols 43 and 45.
Weinreb, Steven M., Bulletin des Societes Chimiques Belges, 1992, vol. 101, # 5, p. 381 - 392