Asymmetric Total Synthesis of (−)-Agelastatin A Using Sulfinimine (N-Sulfinyl Imine) Derived Methodologies
摘要:
The asymmetric synthesis of the cytotoxic marine metabolite (-)-agelastatin A (1) has been achieved from the C-ring intermediate 4,5-diamino cyclopenten-2-enone (-)-2. This key intermediate was efficiently prepared from the sulfinimine-derived alpha,beta-diamino ester 4 using ring-closing metathesis.
作者:Franklin A. Davis、Junyi Zhang、Yanfeng Zhang、Hui Qiu
DOI:10.1080/00397910802618885
日期:2009.5.7
key steps in the synthesis of the architecturally unique tetracyclic antitumor alkaloid (–)-agelastatin A (1) improved the overall yield of the 11-step process (eight operations) from 9% to 23%. Changing the solvent and using a more efficient N-benzyl deprotecting-group procedure enhanced the yields of the C-ring and D-ring intermediates, (–)-4 and (–)-7, respectively. Bromination of (–)-7 with 1,3-dibromo-5