Cross-Dimerization of 2,5-Dihydrofuran with Conjugated Dienes Catalyzed by (Chiral Diene)ruthenium(0) Complexes and Origins of the Enantioselectivity
作者:Masafumi Hirano、Shuhei Machida、Ryota Abe、Takuya Mishina、Nobuyuki Komine、Hsyueh-Liang Wu
DOI:10.1021/acs.organomet.1c00368
日期:2021.10.25
A new chiral diene complex of Ru(0), [Ru(η6-naphthalene)η4-(1S,4S)-1,7,7-trimethyl-2,5-diphenylbicyclo[2.2.1]hepta-2,5-diene}] (2a), catalyzes cross-dimerizations of 2,5-dihydrofuran with conjugated dienes. Treatment of 2,5-dihydrofuran (4a) with 2-phenylbutadiene (5f) catalyzed by 2a (5 mol %) at 30 °C in acetone produces the cross-dimers (E)-3-(3-phenylbut-2-en-1-yl)-2,3-dihydrofuran (6af) and
Ru(0), [Ru(η 6 -naphthalene)η 4 -(1 S ,4 S )-1,7,7-trimethyl-2,5-diphenylbicyclo[2.2.1]hepta 的新型手性二烯配合物-2,5-二烯}] ( 2a ),催化 2,5-二氢呋喃与共轭二烯的交叉二聚反应。2,5-二氢呋喃(治疗4A)与2- phenylbutadiene(5F通过催化)2A的丙酮(5摩尔%)在30℃下产生的横二聚体(É)-3-(3-苯基丁-2-烯-1-基)-2,3-二氢呋喃(6af)和(E)-3-(2-苯基丁-2-烯-1-基)-2,3-二氢呋喃(9af),产率为89%(6af / 9af= 41/48) 具有高对映选择性(9af 的ee 为 91% )。的绝对构型9AF被确定为是- [R通过单晶X射线光谱。评估了 2,5-二氢呋喃与共轭二烯的一系列对映选择性交叉二聚反应,以了解对映选择性交叉二聚反应的机理。