Synthesis of Carbonates and Related Compounds from Carbon Dioxide via Methanesulfonyl Carbonates
作者:Mark O. Bratt、Paul C. Taylor
DOI:10.1021/jo026753g
日期:2003.7.1
Carbonate anions resulting from reaction of primary or secondary alcohols with carbon dioxide, when added to methanesulfonic anhydride in cooled acetonitrile solution, yield methanesulfonyl carbonates, a new class of synthetic intermediate. Base-mediated reaction of the methanesulfonyl carbonates with alcohols, thiols, and amines yields carbonates, thiocarbonates, and carbamates, respectively. Overall
The invention relates to novel 1-arylpyrazole oxime derivatives, of general formula (I) or (I bis)
These compounds are found to be generally safe systemic insecticides for control of arthropod, nematode, helminth or protozoan pests including compositions and derivatives thereof.
beta-DIHYDROFURAN DERIVING COMPOUND, METHOD FOR PRODUCING beta-DIHYDROFURAN DERIVING COMPOUND OR beta-TETRAHYDROFURAN DERIVING COMPOUND, beta-GLYCOSIDE COMPOUND, METHOD FOR PRODUCING beta GLYCOSIDE COMPOUND, AND METHOD FOR PRODUCING 4'-ETHYNYL D4T AND ANALOGUE COMPOUNDS THEREOF
申请人:Iriyama Yusuke
公开号:US20120322995A1
公开(公告)日:2012-12-20
The invention provides a process for producing a β-dihydrofuran derivative represented by formula (1) or a β-tetrahydrofuran derivative represented by formula (4), characterized in that the process includes causing a dialkyl dicarbonate, a diaralkyl dicarbonate, or a halide to act on a diol compound represented by formula (2) or (3). The invention also provides a process for producing 4′-ethynyl-2′,3′-didehydro-3′-deoxythymidine or an analog thereof, the process including glycosylation and deprotection.
A process is described for converting the C(7) hydroxy group of a 10-acyloxy-7-hydroxytaxane to an acetal or ketal, the process comprising treating the 10-acyloxy-7-hydroxytaxane with a ketalizing agent in the presence of an acid catalyst to form a C(7) ketalized taxane of the formula
or
wherein either X31 or X32 represents the 10-acyloxy-7-hydroxytaxane moiety and the other of X31 and X32 as well as X33 and X34 are independently hydrocarbyl, substituted hydrocarbyl or heteroaryl moieties. Taxanes having a ketalized C(7) hydroxy group are also described.
METHOD FOR PRODUCING N-ALKOXYCARBONYLPIPERIDINE DERIVATIVE, AND INTERMEDIATE THEREFOR
申请人:YUKI GOSEI KOGYO CO., LTD.
公开号:US20210122729A1
公开(公告)日:2021-04-29
The object of the present invention is to provide a simple method for preparing an N-alkoxycarbonyl piperidine derivative.
The object can be solved by a method for preparing a hydroxypiperidine derivative, comprising a step of:
(A) reacting a piperidylidene acetic acid derivative represented by the formula (1):
wherein R
1
is an aralkyl group which may have a substituent group, and R
2
is an alkyl group, with 4-hydroxypiperidine in the presence of base, to obtain a hydroxypiperidine derivative represented by the formula (2) or the formula (3):
wherein R
1
is an aralkyl group which may have a substituent group.