One-Pot Synthesis of α-Amino Acids from CO<sub>2</sub> Using a Bismetal Reagent with Si–B Bond
作者:Tsuyoshi Mita、Jianyang Chen、Masumi Sugawara、Yoshihiro Sato
DOI:10.1021/ol302952r
日期:2012.12.21
TsOH·H2O, precursors of N-Boc-imines can be converted into the corresponding α-aryl or α-alkenyl glycine derivatives under gaseous CO2 in moderate-to-high yields with a single operation. α-Isobutenyl glycine thus obtained can be further derivatized into various types of α-aminoacids including N-Boc-leucine, serine, and glycine derivatives in short steps.
One-Pot Synthesis of α-Amino Acids from Imines through CO2 Incorporation: An Alternative Method for Strecker Synthesis
作者:Tsuyoshi Mita、Jianyang Chen、Masumi Sugawara、Yoshihiro Sato
DOI:10.1002/anie.201006422
日期:2011.2.7
It′s a gas: A novel one‐pot process for the synthesis of α‐amino acids from imine equivalents using CO2 gas as a carbon source has been developed. This reaction was made possible by the reagent combination of TMSSnBu3 and CsF (see scheme). Three successive reactions (imine formation, stannylation, and carboxylation) proceeded in the same flask under these conditions to give products in up to 79 % yield
novel and efficient method for the enantioselective synthesis of N-Boc protected phenylglycines. Yields and enantiomeric ratios vary widely depending on the nature of the solvent, the substrate and on the method of forming the chiral complex. Results show that the major reaction pathway is an enantioselective deprotonation/substitution process. The enantioselectivity appears to be limited by the chiral
The invention relates to compounds of formula (I)
Z-C(R
1
R
2
)—C(R
3
NH
2
)—C(R
4
R
5
)—X—N(R
6
R
7
) (I),
wherein Z, R
1-7
and X have the meaning as cited in the description and the claims. Said compounds are useful as DPP-IV inhibitors. The invention also relates to the preparation of such compounds as well as the production and use thereof as medicament.
6 Substituted 2, 3,4,5 Tetrahydro-1H-Benzo[d]Azepines as 5-HT2c Receptor Agonist
申请人:ALLEN JOHN GORDON
公开号:US20120028961A1
公开(公告)日:2012-02-02
The present invention provides 6-substituted 2,3,4,5-tetrahydro-1H-benzo[d]azepines of Formula I as selective 5-HT
2C
receptor agonists for the treatment of 5-HT
2C
associated disorders including obesity, obsessive/compulsive disorder, depression, and anxiety:
where:
R
6
is —S—R
14
; and other substituents are as defined in the specification.