Catalytic, Enantioselective, Intramolecular Sulfenofunctionalization of Alkenes with Phenols
作者:Scott E. Denmark、David J. P. Kornfilt
DOI:10.1021/acs.joc.7b00295
日期:2017.3.17
The catalytic, enantioselective, cyclization of phenols with electrophilic sulfenophthalimides onto isolated or conjugated alkenes affords 2,3-disubstituted benzopyrans and benzoxepins. The reaction is catalyzed by a BINAM-based phosphoramide Lewis base catalyst which assists in the highly enantioselective formation of a thiiranium ion intermediate. The influence of nucleophile electron density, alkene
Wessely oxidation of 5-(2-hydroxyphenyl)-1-pentene and -1-penten-3-ones followed by intramolecular Diels-Alderreactions gave homoisotwistanes; similar treatment of 5-(2-hydroxyphenyl)-3-methylene-1-pentene gave twistane and isotwistane derivatives.
Palladium-Catalyzed Remote 1,<i>n</i>-Arylamination of Unactivated Terminal Alkenes
作者:Chunhua Han、Zhiyuan Fu、Songjin Guo、Xinxin Fang、Aijun Lin、Hequan Yao
DOI:10.1021/acscatal.9b00688
日期:2019.5.3
palladium-catalyzed remote 1,n-arylamination (from 1,3- to 1,11-arylamination) of unactivated terminal alkenes with aryl iodides and arylamines has been realized. This three-component reaction proceeded via Pd-catalyzed Heck arylation, alkene isomerization, and aza-Michael addition, exhibiting good regio- and chemoselectivity, and wide substrate scope. Preliminary mechanistic studies indicated that the
The present invention provides a 2,3-dihydro-6-nitroimidazo[2,1-b]oxazole compound represented by the following general formula:
wherein R
1
represents a hydrogen atom or C1-C6 alkyl group, n represents an integer of 0 to 6, R
2
represents a group —OR
3
or the like, and R
3
represents a hydrogen atom, C1-C6 alkyl group or the like, or R
1
and —(CH
2
)
n
R
2
may bind to each other together with carbon atoms adjacent thereto through nitrogen atoms so as to form a spiro ring represented by the general formula (H):
wherein R
41
is hydrogen, C1-C6 alkyl group or the like. The present compound has an excellent bactericidal action against
Mycobacterium tuberculosis
, multi-drug-resistant
Mycobacterium tuberculosis
, and atypical acid-fast bacteria.
The present invention provides a 2,3-dihydro-6-nitroimidazo[2,1-b]oxazole compound represented by the following general formula:
wherein R1 represents a hydrogen atom or C1-C6 alkyl group, n represents an integer of 0 to 6, R2 represents a group -OR3 or the like, and R3 represents a hydrogen atom, C1-C6 alkyl group or the like, or R1 and -(CH2)nR2 may bind to each other together with carbon atoms adjacent thereto through nitrogen atoms so as to form a spiro ring represented by the general formula (H):
wherein R41 is hydrogen, C1-C6 alkyl group or the like. The present compound has an excellent bactericidal action against Mycobacterium tuberculosis, multi-drug-resistant Mycobacterium tuberculosis, and a typical acid-fast bacteria.