Highly Enantioselective Addition of 1-Fluoro-1-nitro(phenylsulfonyl)methane to α,β-Unsaturated Aldehydes
作者:Martin Kamlar、Natalia Bravo、Andrea-Nekane R. Alba、Simona Hybelbauerová、Ivana Císařová、Jan Veselý、Albert Moyano、Ramon Rios
DOI:10.1002/ejoc.201000851
日期:——
An organocatalytic, highlyenantioselectiveaddition of 1-fluoro-1-nitro(phenylsulfonyl)methane to α,β-unsaturated aldehydes is reported. The reaction is simply catalyzed by secondary amines and furnishes the corresponding fluorinated derivatives in good yields, with moderate diastereoselectivities and excellent enantioselectivities. The absolute configuration of the major diastereomers was unambiguously
报道了 1-氟-1-硝基(苯磺酰基)甲烷与 α,β-不饱和醛的有机催化、高度对映选择性加成。该反应简单地由仲胺催化,并以良好的收率提供相应的氟化衍生物,具有适中的非对映选择性和优异的对映选择性。通过 X 射线衍射分析明确确定了主要非对映异构体的绝对构型。
The enantioselective addition of 1-fluoro-1-nitro(phenylsulfonyl)methane to isatin-derived ketimines
An asymmetric organocatalytic addition of fluorinated phenylsulfonylnitromethane to isatin-derived ketimines was developed. The reaction was efficiently catalyzed by chiral tertiary amine, cinchonine. This methodology provides a new type of optically active compounds with two adjacent quaternary carbon stereocenters in good yields (up to 96%), moderated diastereoselectivity (up to 5.7:1 dr) and excellent
A highly chemo‐ and enantioselectiveorganocatalyticaddition of fluorocarbon nucleophiles, such as 1‐fluoro‐bis(phenylsulfonyl)methane, to α,β‐unsaturatedaldehydes is presented (see scheme). The reactions are catalyzed by simple chiral amines and give access to optically active fluorine derivatives in good yields and up to 95 % ee. Notably, the methodology can be applied to the formation of a chiral
Enantioselective Synthesis of α-Fluorinated β-Amino Acid Derivatives by an Asymmetric Mannich Reaction and Selective Deacylation/Decarboxylation Reactions
作者:Yuanhang Pan、Yujun Zhao、Ting Ma、Yuanyong Yang、Hongjun Liu、Zhiyong Jiang、Choon-Hong Tan
DOI:10.1002/chem.200902830
日期:2010.1.18
degradation: A highly enantio‐ and diastereoselective guanidine‐catalyzed Mannich reaction was developed with α‐fluoro‐β‐keto acyloxazolidinone as the fluorocarbon nucleophile (see scheme). α‐Fluoro‐β‐amino ester and α‐fluoro‐β‐amino ketones with chiral fluorinated carbon were obtained by selective deacylation and decarboxylation reactions, respectively.
Diasteroselective and Enantioselective Ir-Catalyzed Allylic Substitutions of 1-Substituted 1-Fluoro-1-(arenesulfonyl)methylene Derivatives
作者:Jiteng Chen、Xiaoming Zhao、Wenyan Dan
DOI:10.1021/acs.joc.7b01782
日期:2017.10.6
diasteroselective and enantioselective Ir-catalyzed allylic substitutions of 1-substituted 1-fluoro-1-(arenesulfonyl)methylenederivatives are presented, which afford the fluorinated allyl products with two chirality centers. The steric demand of 1-substituted 1-fluoro-1-(arenesulfonyl)methylenederivatives and allylic substrates has a great influence on the dr values of these reactions. The transformation of the