Rhodium-Catalyzed Asymmetric Addition to 4- or 5-Carbonyl-cycloenones through Dynamic Kinetic Resolution: Enantioselective Synthesis of (−)-Cannabidiol
作者:Wen-Cong Li、He Meng、Jialin Ming、Shufeng Chen
DOI:10.1021/acs.orglett.3c04281
日期:2024.2.23
The reaction of 4/5-carbonyl-cycloalkenone 1 or its achiral isomer 1′ with organoboronicacid 2 in the presence of a chiral diene (S,S)-Fc-tfb-rhodium catalyst gave disubstituted trans-cycloalkanone 3 with high diastereo- and enantioselectivity. This highly efficient dynamic kinetic resolution is achieved by fast racemization of 1 through the formation of a dienolate followed by kinetic resolution
4/5-羰基-环烯酮1或其非手性异构体1'与有机硼酸2在手性二烯( S , S )-Fc-tfb-铑催化剂存在下反应,得到具有高非对映异构体的二取代反式环烷酮3。和对映选择性。这种高效的动态动力学拆分是通过形成二烯醇化物使1快速外消旋化,然后使用手性催化剂进行动力学拆分来实现的。该实用性通过合成 (−)-大麻二酚途中的关键中间体得到证明。