Facile Synthesis of Oxazoles Starting from Ketones
作者:Jong Chan Lee、Sehyun Kim、Yong Chan Lee
DOI:10.1081/scc-120018792
日期:2003.1.5
Abstract A new and efficient method for the preparation of 2,4- and 2,4,5-substituted oxazoles is described which is based upon the reaction of α-sulfonyloxy ketone intermediates with acetamide or benzamide.
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.
Novel oxazole derivatives of the formula
wherein R1 is hydrogen or a straight, branched or cyclic alkyl group of 1 to 6 carbon atoms, R2 is hydrogen, halogen, trifluoromethyl, or a straight, branched or cyclic alkylthio of 1 to 3 carbon atoms, and n is 1 or 2 or pharmaceutically acceptable salts or esters thereof are synthesized through several routes. The derivatives have hypoglycemic, glucose tolerance improving and insulin sensitivity increasing activities and are of value as antidiabetic drugs.
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.
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 atypical acid-fast bacteria.