Catalytic carbon–sulfur bond formation by amphoteric vanadyl triflate: exploring with thia-Michael addition, thioacetalization, and transthioacetalization reactions
摘要:
A series of thiols have been examined as protic nucleophiles for Michael-type additions to alpha,beta-unsaturated carbonyls as well as double nucleophilic condensations with aldehydes, ketones, and acetals catalyzed by amphoteric, water-tolerant vanadyl triflate under mild and neutral conditions. The newly developed C-S bond formation protocols were carried out smoothly in good to high yields in a highly chemoselective manner. (C) 2009 Elsevier Ltd. All rights reserved.
METHOD FOR OXIDATIVE CLEAVAGE OF COMPOUNDS WITH UNSATURATED DOUBLE BOND
申请人:NATIONAL TSING HUA UNIVERSITY
公开号:US20210206702A1
公开(公告)日:2021-07-08
A method for oxidative cleavage of a compound with an unsaturated double bond is provided. The method includes the steps of:
(A) providing a compound (I) with an unsaturated double bond, a trifluoromethyl-containing reagent, and a catalyst;
wherein, the catalyst is represented by Formula (II):
M(O)
m
L
1
y
L
2
z
(II);
wherein, M, L
1
, L
2
, m, y, z, R
1
, R
2
and R
3
are defined in the specification; and
(B) mixing the compound with an unsaturated double bond and the trifluoromethyl-containing reagent to perform an oxidative cleavage of the compound with the unsaturated double bond by using the catalyst in air or under oxygen atmosphere condition to obtain a compound represented by Formula (III):
Mononuclear and Mixed-Valence Binuclear Oxovanadium Complexes with Benzimidazole-Derived Chelating Agents
作者:Shyamali Ghosh、Kausik K. Nanda、Anthony W. Addison、Raymond J. Butcher
DOI:10.1021/ic010945x
日期:2002.4.1
oxovanadium(IV) complexes, [V(IV)O(Hntb)].2MeOH (5), [V(IV)O(H(3)ntb)Cl]Cl.H(2)O (7), [V(IV)O(Me(3)ntb)SO(4)].H(2)O (9), [V(IV)O(Me(3)ntb)Cl]Cl.H(2)O (10), and mixed-valencecomplexes, [(H(3)ntb)V(IV)O(mu-O)V(V)O(H(3)ntb)](CF(3)SO(3))(3).2H(2)O (8) and [(Me(3)ntb)V(IV)O(mu-O)V(V)O(Me(3)ntb)](CF(3)SO(3))(3).3H(2)O (11). Crystal structures of 2, 7, and 11 are reported. The mixed-valencecomplexes, 8 and 11
Vanadyl triflate as an efficient and recyclable catalyst for chemoselective thioacetalization of aldehydes
作者:Surya Kanta De
DOI:10.1016/j.molcata.2004.09.044
日期:2005.2
Vanadyl triflate has been found to be an efficient and recyclable catalyst for chemoselective protection of aldehydes. Some of the major advantages of this method are high chemoselectivity, ease of operation, short reaction times, high yields, and compatibility with protecting groups. (C) 2004 Elsevier B.V. All rights reserved.
Vanadyl species-catalyzed complementary β-oxidative carbonylation of styrene derivatives with aldehydes
By judicious choice of the counter anions in the vanadyl catalysts, we can achieve β-hydroxylated and t-butyl peroxylated carbonylation of styrenes by aromatic 1° and 2° alkyl aldehydes in a complementary manner.