An unusual stereochemical outcome of radical cyclization: synthesis of (+)-biotin
作者:Subhash P. Chavan、Amar G. Chittiboyina、Guduru Ramakrishna、Rajkumar B. Tejwani、T. Ravindranathan、Subhash K. Kamat、Beena Rai、Latha Sivadasan、Kamalam Balakrishnan、S. Ramalingam、V.H. Deshpande
DOI:10.1016/j.tet.2005.07.070
日期:2005.9
An enantioselective synthesis of (+)-biotin 1 starting from naturally available cysteine is described. The key steps are the unusual stereochemical outcome of radical cyclization of compound 10 to prepare 5,5-fused system 11, and the introduction of C4-sidechain at C6 in 13 via a Grignard reaction.
描述了从天然可利用的半胱氨酸开始的(+)-生物素1的对映选择性合成。关键步骤是化合物10进行自由基环化以制备5,5-稠合系统11的异常立体化学结果,以及通过格氏反应在13中的C 6处引入C4侧链。