The first phosphine-catalyzed highly enantioselective [3 + 3] cycloaddition of Morita-Baylis-Hillman carbonates with C,N-cyclicazomethineimines is described. Using a spirocyclic chiral phosphine as the catalyst, a novel class of pharmaceutically interesting 4,6,7,11b-tetrahydro-1H-pyridazino[6,1-a]iso-quinoline derivatives were obtained in high yields with good to excellent diastereoselectivities
Palladium-Catalyzed Alkynylation of Morita–Baylis–Hillman Carbonates with (Triisopropylsilyl)acetylene on Water
作者:Yangxiong Li、Li Liu、Delong Kong、Dong Wang、Weichun Feng、Tao Yue、Chaojun Li
DOI:10.1021/acs.joc.5b00728
日期:2015.6.19
Direct alkynylation of Morita–Baylis–Hillman carbonates with (triisopropylsilyl)acetylene catalyzed by a Pd(OAc)2–NHC complex was developed “on water” to give the corresponding 1,4-enynes. The significant effects of water amount in the solvent on further transformations of 1,4-enynes were investigated.
Organocatalytic asymmetric allylic alkylation of oxindoles with Morita–Baylis–Hillman carbonates
作者:Kun Jiang、Jing Peng、Hai-Lei Cui、Ying-Chun Chen
DOI:10.1039/b905177e
日期:——
The organic Lewis base-catalysed asymmetricallylicalkylation of 3-substituted oxindoles with Morita-Baylis-Hillman carbonates is reported, affording multifunctional oxindoles with adjacent quaternary and tertiary chiral centres (dr up to 92 : 8, 86-97% ee).
Chiral phosphine-catalyzed asymmetric allylic alkylation of 3-substituted benzofuran-2(3H)-ones or oxindoles with Morita–Baylis–Hillman carbonates
作者:De Wang、Yuan-Liang Yang、Jia-Jun Jiang、Min Shi
DOI:10.1039/c2ob25694k
日期:——
An efficient chiral phosphine-catalyzed asymmetric substitution reaction of MBH carbonates with 3-substituted benzofuran-2(3H)-ones or 3-substituted oxindoles has been described in this context, giving the corresponding allylicalkylation products bearing adjacent quaternary and tertiary stereogenic centers in high yields, moderate diastereoselectivities and high enantioselectivities under mild conditions
Highly enantioselective direct allylic alkylation of butenolides with Morita–Baylis–Hillman carbonates catalyzed by chiral squaramide-phosphine
作者:Tian-Chen Kang、Xuan Zhao、Feng Sha、Xin-Yan Wu
DOI:10.1039/c5ra14667d
日期:——
An efficient asymmetric vinylogous allylic alkylation of β,γ-butenolides with Morita–Baylis–Hillman carbonates has been developed. With a chiral cyclohexane-based squaramide-phosphine catalyst 5e, optically active γ,γ-disubstituted butenolides containing adjacent quaternary and tertiary chiral centers have been constructed in good-to-excellent yields (up to 98%) and excellent stereoselectivities (87 : 13–99 : 1