Catalytic Enantioselective Petasis-Type Reaction of Quinolines Catalyzed by a Newly Designed Thiourea Catalyst
摘要:
A newly designed thiourea catalyst provides sufficient activation of organoboronic acids to facilitate the enantioselective Petasis transformation of quinolines even at low temperatures. A high degree of stereocontrol was achieved in the reaction of various quinolines and organoboronic acids by using a combination of H2O and NaHCO3 as additives.
Catalytic Enantioselective Petasis-Type Reaction of Quinolines Catalyzed by a Newly Designed Thiourea Catalyst
摘要:
A newly designed thiourea catalyst provides sufficient activation of organoboronic acids to facilitate the enantioselective Petasis transformation of quinolines even at low temperatures. A high degree of stereocontrol was achieved in the reaction of various quinolines and organoboronic acids by using a combination of H2O and NaHCO3 as additives.
α,β-Differentiated tandem diamination of cinnamic esters using N,N-dichloro-2-nitrobenzenesulfonamide and acetonitrile as the nitrogen sources
作者:Guigen Li、Sun Hee Kim、Han-Xun Wei
DOI:10.1016/s0040-4039(00)01579-3
日期:2000.11
Tandem diamination of cinnamic esters provides a new approach to anti alkyl N alpha-(2-Ns), N beta -Ac diaminophenylpropionates. The new reaction proceeds to completion within 3 hours at room temperature using N,N-dichloro-2-nitrobenzenesulfonamide (2-NsNCl(2)) as the nitrogen source in acetonitrile, which is also involved in the reaction process. Seven diamine derivatives have been obtained with good yields and stereoselectivity. (C) 2000 Elsevier Science Ltd. All rights reserved.
Catalytic Enantioselective Petasis-Type Reaction of Quinolines Catalyzed by a Newly Designed Thiourea Catalyst
作者:Yousuke Yamaoka、Hideto Miyabe、Yoshiji Takemoto
DOI:10.1021/ja071470x
日期:2007.5.1
A newly designed thiourea catalyst provides sufficient activation of organoboronic acids to facilitate the enantioselective Petasis transformation of quinolines even at low temperatures. A high degree of stereocontrol was achieved in the reaction of various quinolines and organoboronic acids by using a combination of H2O and NaHCO3 as additives.