Asymmetric Michael Addition Reactions between 3-Substituted Benzofuran-2(3H)-ones and 1,1-Bis(phenylsulfonyl)ethylene Catalyzed by Bifunctional Catalysts Containing Tertiary Amine and Thiourea Groups
Highly enantioselective catalytic conjugate additions of 3-substituted benzofuran-2(3H)-ones to 1,1-bis(phenylsulfonyl)ethylene in the presence of catalysts based on Cinchona alkaloids and containing tertiaryamine and thiourea groups have been developed. Good to excellent stereoselectivities (up to 99 % ee) could be achieved. An interesting effect of substituent positions on stereoselectivities was
Chiral Calcium Phosphate Catalyzed Enantioselective Amination of 3-Aryl-2-benzofuranones
作者:Ruihan Liu、Suvratha Krishnamurthy、Zhenwei Wu、K. S. Satyanarayana Tummalapalli、Jon C. Antilla
DOI:10.1021/acs.orglett.0c03059
日期:2020.10.16
4-tert-butyl-phenyl substituted (R)-[H8]-BINOL chiral calcium phosphate catalyzedenantioselectiveamination of 3-aryl-2-benzofuranones with dibenzyl azodicarboxylate is described. The catalyst loading of the reaction is 1 mol %. This transformation is facile and has a high degree atom economy, which gave products with good yields and high enantioselectivities (79% to 99%). This reaction has excellent ee
Rathore; Reddy, Journal of the Indian Chemical Society, 1984, vol. 61, # 6, p. 556 - 558
作者:Rathore、Reddy
DOI:——
日期:——
RATHORE, H. G. S.;REDDY, V. M., J. INDIAN CHEM. SOC., 1984, 61, N 6, 556-558
作者:RATHORE, H. G. S.、REDDY, V. M.
DOI:——
日期:——
Anti-Radical Agents
申请人:Baschong Werner
公开号:US20080305055A1
公开(公告)日:2008-12-11
Compounds of the formulae (1), (2) and selected hindered nitroxyl, hydroxylamine and hydroxylamine salt compounds such as the compound of formula (3), wherein Gi is hydrogen; C
1
-C
22
alkyl; C
1
-C
22
alkylthio; C
2
-C
22
alkylthioalkyl; C
5
-C
7
cycloalkyl; phenyl; C
7
-C
9
phenylalkyl; or SO
3
M; G
2
is C
1
-C
22
alkyl; C
5
-C
7
cycloalkyl; phenyl; or C
7
-C
9
phenylalkyl; E is oxyl or hydroxyl; V is —O—; or —NH—; a is 0 or 1 or 2; b, c and d and g are each independently of one another 0 or 1; e is an integer from 1 to 4; f, m, n and p are each independently of one another an integer from 1 to 3; q is 0 or an integer from 1 to 3; Q, T and G
3
are as defined in claim
1
; G
4
and G
5
are each independently of the other hydrogen; or C
1
-C
22
alkyl; exhibit marked antiinflammatory action.