The Development of a Convergent and Efficient Enantioselective Synthesis of the Bengamides via a Common Polyol Intermediate
作者:Robert K. Boeckman, Jr.、Tammy J. Clark、Brian C. Shook
DOI:10.1002/hlca.200290026
日期:2002.12
the bengamide family of antitumor agents from a common polyol thioester is described. Consecutive aldol condensations afford the protected polyol thioester side chain suitable for coupling to the bengamides. A novel chiral-phase-transfer-catalyzed enantioselective alkylation affords the properly functionalized caprolactams required for the synthesis of more-complex members of the bengamide family. Use
作者:Wenming Liu、Joanna M Szewczyk、Liladhar Waykole、Oljan Repič、Thomas J Blacklock
DOI:10.1016/s0040-4039(02)00022-9
日期:2002.2
A total synthesis of bengamideE is reported. The synthesis includes the utilization of d-tartrate as the chiral building block, construction of the E-olefin by the Julia protocol, an anti-aldol reaction to generate C-2 and C-3 stereocenters, and coupling of the thioester with caprolactam hydrochloride using sodium 2-ethylhexanoate.
A practical and efficient method for the synthesis of .beta.-lactones
作者:Rick L. Danheiser、James S. Nowick
DOI:10.1021/jo00003a047
日期:1991.2
This paper describes a convenient one-step preparation of beta-lactones based on the addition of thiol ester enolates to carbonyl compounds. Under the proper conditions the resulting aldolates undergo spontaneous cyclization to produce beta-lactones in good to excellent yield. The new beta-lactone synthesis provides access to 2-oxetanones with a variety of substituents and substitution patterns. In general, thiol ester enolates combine with carbonyl compounds to form the less sterically crowded beta-lactone diastereomers, and in some cases the reaction proceeds with excellent stereoselectivity. In conjunction with the stereospecific decarboxylation of beta-lactones, this chemistry also provides a very attractive approach to the synthesis of substituted alkenes.
SYNTHESIS OF b-LACTONES AND ALKENES VIA THIOL ESTERS: (E)-2,3-DIMETHYL-3-DODECENE
作者:Danheiser, Rick L.、Nowick, James S.、Lee, Janette H.、Miller, Raymond F.、Huboux, Alexandre H.、Mathre, David J.、Shinkai, Ichiro
DOI:10.15227/orgsyn.073.0061
日期:——
Photochemistry of .alpha.-diazo thioesters: migratory aptitude of sulfur vs. oxygen in the photochemical Wolff rearrangement