Rhodium-catalyzed phenylation of N-arylsulfonyl aldimines with sodium tetraphenylborate or trimethyl(phenyl)stannane
作者:Masato Ueda、Norio Miyaura
DOI:10.1016/s0022-328x(99)00562-8
日期:2000.1
The rhodium-catalyzedaddition reactions of trimethyl(phenyl)stannane and sodium tetraphenylborate to N-phenylsulfonyl aldimines RCHNSO2Ph (R=alkyl and aryl) provided R(Ph)CHNHSO2Ph in high yields. A cationic and free phosphine complex [Rh(cod)(MeCN)2]BF4 was found to be an efficient catalyst for the addition of PhSnMe3, whereas [Rh(cod)(MeCN)2]BF4/dppb catalyzed the addition of Ph4BNa to various
Direct Carbon−Carbon Bond Formation via Soft Enolization: A Biomimetic Asymmetric Mannich Reaction of Phenylacetate Thioesters
作者:Mark C. Kohler、Julianne M. Yost、Michelle R. Garnsey、Don M. Coltart
DOI:10.1021/ol101152b
日期:2010.8.6
cinchona alkaloid-based amino (thio)urea catalysts is reported that employs proximity-assisted soft enolization. This approach to enolization is based on the cooperative action of a carbonyl-activating hydrogen bonding (thio)urea moiety and an amine base contained within a single catalytic entity to facilitate intracomplex deprotonation. Significantly, this allows thioesters over a range of acidity to react
Aziridination and unpredicted homologation reaction of N-sulfonylimines were achieved easily with a very simple, rapid and mild procedure through the use of diazomethane without the presence of any catalyst. The method represents an attractive alternative to metal-catalyzed processes.
Catalytic Enantioselective Synthesis of α,β-Diamino Acid Derivatives
作者:Le Li、Madhu Ganesh、Daniel Seidel
DOI:10.1021/ja9034494
日期:2009.8.26
Highly enantio- and diastereoselective organocatalytic Mannich additions of alpha-isothiocyanato imides to sulfonyl imines are reported. Enantiomerically enriched syn-alpha,beta-diamino acidderivatives can be obtained in excellent yields using catalyst loadings as low as 0.25 mol %.
Direct Carbon-Carbon Bond Formation via Soft Enolization of Thioesters: An Operationally Simple Mannich Addition Reaction
作者:Don M. Coltart、Julianne Yost、Michelle Garnsey、Mark Kohler
DOI:10.1055/s-0028-1083278
日期:2009.1
Thioesters undergo soft enolization and direct Mannich addition to sulfonylimines on treatment with magnesium bromide ethyl etherate and N,N-diisopropylethylamine. The reactions proceed readily with a range of sulfonylimines and, in the case of 2,4,6-triisopropylphenyl thiopropionate, give moderate to good syn diastereoselectivity. enolates - imines - Mannich addition reactions - magnesium - thioesters