Synthesis of new brassinosteroids with potential activity as antiecdysteroids
摘要:
The synthesis of four new brassinosteroids with 2 beta,3 beta-diol functionality and A/B cis and A/B trans ring function is reported. These brassinosteroids could present activity as antiecdysteroids.
Synthesis of new brassinosteroids with potential activity as antiecdysteroids
摘要:
The synthesis of four new brassinosteroids with 2 beta,3 beta-diol functionality and A/B cis and A/B trans ring function is reported. These brassinosteroids could present activity as antiecdysteroids.
作者:Trevor C. McMorris、Rodrigo G. Chavez、Prakash A. Patil
DOI:10.1039/p19960000295
日期:——
Brassinolide has been synthesized from stigmasterol in an overall yield of 7%. The key step in the synthesis is aldol condensation of 2α,3α-isopropylidenedioxy-6-oxo-23,24-dinor-5α-cholan-22-al with 3-isopropylbut-2-enolide carried out at – 78 °C, which gives a product with 22R,23R stereochemistry in high yield. Catalytic hydrogenation of this product is highly stereoselective leading to the desired
The synthesis of four newbrassinosteroid analogs is reported. Two of them elicited high activity as plant growth promoters. Also a newway to define the structuralrequirements, that can explain the relative high activity of these compounds, is presented.