Serinol-Derived Malyngamides from an Australian Cyanobacterium
作者:Feng Wan、Karen L. Erickson
DOI:10.1021/np990291t
日期:1999.12.1
Serinol derivatives 4a and 4b were isolated from an Australian blue-green alga and characterized by spectroscopic means. Their absolute stereochemistry was established by chemical methods.
An Improved Asymmetric Synthesis of Malyngamide U and Its 2′-Epimer
作者:Jian-Peng Feng、Zi-Fa Shi、Yang Li、Jun-Tao Zhang、Xian-Liang Qi、Jie Chen、Xiao-Ping Cao
DOI:10.1021/jo800876u
日期:2008.9.1
An accelerated and improved asymmetric synthesis of malyngamide U (1) and its 2'-epimer (2'-epi-1) was accomplished from readily available n-hexanal, ethanolamine and (R)-(-)-carvone. The key steps involved a Johnson-Claisen rearrangement in the synthesis of an unsaturated carboxylic acid 4 and an aldol reaction in the construction of the skeleton of I and 2'-epi-1. There are 13 steps in the synthesis, with a 2.7% overall yield for 1 and a 0.4% yield for 2'-epi-1.