Catalytic enantioselective allylboration of propargylic aldehydes
作者:Urmibhusan Bhakta、Erin Sullivan、Dennis G. Hall
DOI:10.1016/j.tet.2013.11.095
日期:2014.1
Homoallylic propargylicalcohols are important building blocks in natural product synthesis. This moiety can be transformed into various other structures by performing other known transformations, which can in turn lead to the synthesis of biologically useful compounds. Herein, a methodology based on Lewisacid assisted Brønstedacid catalysed allylboration of propargylic aldehydes is described. A
Cochleamycin A (1) was synthesized in 2.4% overall yield via a 23-step linear sequence starting from 3-butene-1-ol. Key features of the synthesis include the synthesis of (2)-1,3-diene 21 via a Stille coupling of 4 and 5 and a transannular Diels-Alder reaction of macrocycle 26 to provide the complete carbon skeleton of 1.
Confirmation of the Stereostructure of (+)-Cytostatin by Fluorous Mixture Synthesis of Four Candidate Stereoisomers
作者:Won-Hyuk Jung、Sabrina Guyenne、Concepción Riesco-Fagundo、John Mancuso、Shuichi Nakamura、Dennis P. Curran