Intramolecular Nicholas Reactions in the Synthesis of Dibenzocycloheptanes. Synthesis of Allocolchicine NSC 51046 and Analogues and the Formal Synthesis of (−)-Allocolchicine
作者:Sinisa Djurdjevic、Fei Yang、James R. Green
DOI:10.1021/jo101953n
日期:2010.12.3
The preparation of dibenzocycloheptyne-Co2(CO)6 complexes by intramolecular Nicholas reactions of biaryl-2-propargyl alcohol-Co2(CO)6 derivatives is described. Reductive decomplexation of the dibenzocycloheptyne-Co2(CO)6 complexes affords the corresponding dibenzocycloheptenes, individual members of which have been employed in a formal total synthesis of (−)-allocolchicine, the preparation of 6,7-dihydro-3
描述了通过联芳基-2-炔丙醇-Co 2(CO)6衍生物的分子内尼古拉斯反应制备二苯并环庚炔-Co 2(CO)6配合物。对二苯并环庚炔-Co 2(CO)6配合物进行还原性分解,得到相应的对二苯并环庚烯,其中的单个成员已用于(-)-金属酚chicine的正式全合成中,制备6,7-dihydro-3,4, 9,10,11-五甲氧基-5 H-二苯并[ a,c ]环庚烯-5-酮和NSC 51046及其3,8,9,10-四甲氧基区域异构体的对映选择性合成。