Access to Stereodefined Trisubstituted Alkenesvia Rhodium-Catalyzed 1,4-Addition of Potassium Trifluoro(organo)- borates to Baylis–Hillman Adducts
作者:Laure Navarre、Sylvain Darses、Jean-Pierre Genet
DOI:10.1002/adsc.200505336
日期:2006.2
In the presence of a rhodium catalyst, unactivated Baylis–Hillman adducts reacted regioselectively with potassium trifluoro(organo)borates to afford stereodefinedtrisubstitutedalkenes with good yields. This highly efficient reaction (aerobic conditions, low temperature, absence of added phosphane ligand) is believed to proceed via a 1,4-addition/β-hydroxy elimination mechanism.
Efficient and general conditions for the formation of stereodefined trisubstituted alkenes by using the rhodium‐catalyzed reaction of unactivated Baylis–Hillman adducts with either organoboronic acids or potassiumtrifluoro(organo)borates are reported (see scheme).