Total synthesis of phytotoxic herbarumin-I from d-mannitol
作者:Ahmed Kamal、P. Venkat Reddy、S. Prabhakar
DOI:10.1016/j.tetasy.2009.03.039
日期:2009.6
A simple carbohydrate-based convergent approach towards the totalsynthesis of herbarumin-I, a 10-membered lactone is described. The key features of the synthetic strategy include Grignard reaction and ring-closing metathesis reaction for the formation of the 10-membered ring and E-olefinic moiety. d-Mannitol has been used as a chiral pool material for the construction of the key fragment.
A new synthesis of the phytotoxic 10-membered lactone herbarumin I
作者:J. Jon Paul Selvam、K. Rajesh、V. Suresh、D. Chanti Babu、Y. Venkateswarlu
DOI:10.1016/j.tetasy.2009.03.034
日期:2009.6
Herbarumin I a phytotoxic 10-memberedlactone has been synthesized from d-(−)-isoascorbic acid in 12 steps with an overall yield of 16.8%. The methodology involved in generating the stereogenic center at C-8 is a Sharpless asymmetric epoxidation, as well 1,2-asymmetric induction followed by macrolactonization via RCM.
A stereoselectivetotal synthesis of phytotoxic compounds herbarumin I and stagonolide A has been achieved utilizing Crimmin’s protocol for non-Evans anti-aldol approach and a ring-closing olefin metathesis reaction as the key steps. macrolide - phytotoxic - Evans aldol - olefin metathesis