Racemization in combination with a kineticresolution is the base for a dynamic kineticresolution (DKR). Biocatalytic racemization was successfully performed for a broad scope of sec‐alcohols by employing a single alcohol dehydrogenase (ADH) variant from Thermoanaerobacter pseudoethanolicus (formerly T. ethanolicus; TeSADH W110A I86A C295A). The catalyst employed as a lyophilized whole cell preparation
Diverse Asymmetric Hydrofunctionalization of Aliphatic Internal Alkenes through Catalytic Regioselective Hydroboration
作者:Yumeng Xi、John F. Hartwig
DOI:10.1021/jacs.6b02478
日期:2016.6.1
aliphatic internalalkenes with high regioselectivity and enantioselectivity. This process comprises a copper-catalyzed asymmetric hydroboration and subsequent stereospecific derivatizations of the secondary boronates. By this strategy, a range of compounds, such as amides, alkyl fluorides and bromides, alcohols, aldehydes, arenes, and heteroarenes, were synthesized from an internalalkene with high
Highly enantioselective stereo-inverting sec-alkylsulfatase activity of hyperthermophilic Archaea
作者:Sabine R. Wallner、Bettina M. Nestl、Kurt Faber
DOI:10.1039/b504883d
日期:——
rac-sec-Alkyl sulfateesters 1a-8a were resolved in low to excellent enantioselectivities with E-values up to >200 using whole cells of aerobically-grown hyperthermophilic sulfur-metabolizers, such as Sulfolobus solfataricus DSM 1617, Sulfolobus shibatae DSM 5389 and, most notably, Sulfolobus acidocaldarius DSM 639. Significantly enhanced selectivities were obtained using cells grown on sucrose-enriched
1,4-CHIRALITY TRANSFER VIA THE [2,3]-WITTIG REARRANGEMENT OF CHIRAL ALLYLIC PROPARGYL ETHER SYSTEM. A NEW, PRACTICAL ENTRY TO CHIRAL PROPARGYLIC ALCOHOLS
作者:Noboru Sayo、Fumiyuki Shirai、Takeshi Nakai
DOI:10.1246/cl.1984.255
日期:1984.2.5
The [2,3]-Wittig rearrangement of enantiomerically-enriched α-methylallyl propargylethers provides a high degree (ca. 90%) of 1,4-chirality transfer, together with 95–98% of (E)-selectivity. The observed sense of 1,4-chirality transfer is discussed on mechanistic grounds.
[EN] PYRROLIDINE, THIAZOLIDINE AND OXAZOLIDINE COMPOUNDS WHICH INHIBIT DIPEPTIDYL PEPTIDASE-IV (DPP)<br/>[FR] COMPOSE DE PYRROLIDINE, DE THIAZOLIDINE ET D'OXAZOLIDINE INHIBANT LA DIPEPTIDYL-PEPTIDASE-IV (DPP-IV)
申请人:FUJISAWA PHARMACEUTICAL CO
公开号:WO2004111041A1
公开(公告)日:2004-12-23
A compound of the formula (I) or a pharmaceutically acceptable salt thereof: [wherein X is cyano or H; Y is CH?2#191, O, S, SO or SO?2# Z is (lower)alkylene, and the like; R1 and R2 are linked together to form (lower)alkylene or (lower)alkenylene, and R3 is H, (lower)alkyl or hydroxy; and the like; and the (lower)alkylene formed by R1 and R2 and the like may be substituted which may be substituted.] Compounds of formula (I) inhibit DPP-IV activity. They are therefore useful in the treatment of conditions mediated by DPP-IV, such as NIDDM.