Polyol Synthesis with β-Oxyanionic Alkyllithium Reagents: Syntheses of Aculeatins A, B, and D
作者:Viengkham Malathong、Scott D. Rychnovsky
DOI:10.1021/ol901623h
日期:2009.9.17
route was developed. The β-phenylthio alcohols were prepared from opticallypure oxiranes. Deprotonation and reductivelithiationgenerated the key intermediate, a β-oxyanionic alkyllithium reagent. Addition to a Weinreb amide produced the β-hydroxy ketone in >90% yield using only 1.5 equiv of the phenylthio alcohol. Stereoselective reduction of the ketone led to either the syn- or anti-1,3-diol. This simple
A Chiron Approach to the Total Synthesis of (+)-Aculeatin D
作者:Zhi-Bin Zhen、Jian Gao、Yikang Wu
DOI:10.1021/jo801296x
日期:2008.9.19
A synthesis of natural aculeatin D has been achieved, with the key stereogenic centers taken from inexpensive and readily available D-xylose. In elaboration of D-xylose into a desired form readily applicable in synthesis a previously misinterpreted and overlooked abnormal selectivity in hydroxyl protection was noticed and exploited. Protocols were developed for monotosylation of a triol insoluble in