A short and convergent synthesis of a 10-oxa epothilone analog is based on aldolisation of a β-methallyloxy aldehyde derivedfrommethyl 3-hydroxy-2S-methyl propionate followed by ring-closing metathesis.
New Synthetic Technology for the Synthesis of Hindered α-Diazoketones via Acyl Mesylates
作者:K. C. Nicolaou、Phil S. Baran、Yong-Li Zhong、Ha-Soon Choi、Kin Chiu Fong、Yun He、Won Hyung Yoon
DOI:10.1021/ol990790l
日期:1999.9.1
[GRAPHICS]A mild and reliable one pot protocol for the elaboration of sterically demanding carboxylic acids into alpha-diazoketones via acyl mesylates has been developed. Aside from delineating the reaction parameters which render this strategy quite general for hindered carboxylic acids, we have directly proven the existence of the fleeting acyl mesylate group as the reactive species in these reactions and shed light onto the differing mechanisms which are operative in the activation of hindered and simple carboxylic acids with methanesulfonyl chloride.
Nicolaou, K. C.; He, Yun; Vourloumis, Dionisios, Angewandte Chemie, 1996, vol. 108, # 20, p. 2554 - 2556
作者:Nicolaou, K. C.、He, Yun、Vourloumis, Dionisios、Vallberg, Hans、Yang, Zhen