Chemoenzymatic Asymmetric Total Synthesis of Nonanolide (<i>Z</i>)-Cytospolides D, E and Their Stereoisomers
作者:Rohan Kalyan Rej、Samik Nanda
DOI:10.1002/ejoc.201301365
日期:2014.2
asymmetric total synthesis of the (Z)-isomer of the naturally occurring decanolide cytospolidesD, E and six stereoisomers is reported. The main highlight of the synthetic venture involves ring-closing metathesis (RCM) reaction of a suitably functionalized ester compound, which was assembled by the Yamaguchi coupling of the required acid and alcohol fragments. The alcohol fragment was accessed by two
Sequential Pd(0)-, Rh(I)-, and Ru(II)-Catalyzed Reactions in a Nine-Step Synthesis of Clinprost
作者:Emma E. Nagy、I. F. Dempsey Hyatt、Kristen E. Gettys、Shawn T. Yeazell、Stephen K. Frempong、Mitchell P. Croatt
DOI:10.1021/ol303402e
日期:2013.2.1
A step-economical synthesis of clinprost is reported that concludes with 3 different transition metal-catalyzed reactions: Pd-catalyzed decarboxylation with allylic rearrangement, Rh-catalyzed diene-ene [2+2+1] reaction, and Ru-catalyzed cross-metathesis reaction. The complexity bestowed to the molecule from these reactions converts a readily accessible ester to clinprost without using protecting groups
Clinprost, Isocarbacyclin And Analogs Thereof And Methods Of Making The Same
申请人:The University Of North Carolina At Greensboro
公开号:US20140114086A1
公开(公告)日:2014-04-24
In one aspect, methods of synthesizing clinprost, isocarbacyclin and analogs thereof are described herein which, in some embodiments, permit an abbreviated synthetic pathway in comparison to one or more prior synthetic methods. By providing a compact synthetic scheme, methods described herein can reduce cost, waste and time of clinprost and isocarbacyclin synthesis while facilitating the development and investigation of analogs of these compounds.
QUINOLINE-OXAZOLINE COMPOUNDS AND THEIR USE IN OXIDATION SYNTHESIS
申请人:Sigman Matthew Scott
公开号:US20110054176A1
公开(公告)日:2011-03-03
A quinoline-oxazoline compound having the formula:
where one of X
1
and X
2
is N and the other is C and one of R1, R2 and R3 is Z wherein Z is an oxazoline radical having the formula
such that when X
1
is N R2 is Z and R1 is absent, and when X
2
is N either R1 or R3 is Z and R2 is absent. R1 and R3 through R12 are independently H or a pendant moiety which does not interfere with coordination of either N in the quinoline compound with a coordination center. These compounds can be complexed with a suitable coordination center such as catalytically active palladium and can be highly useful in catalytically oxidizing alkenes with high regioselectivity.
Syntheses of Enantiopure Aliphatic Secondary Alcohols and Acetates by Bioresolution with Lipase B from Candida antarctica
作者:Hercules V. Ferreira、Lenilson C. Rocha、Richele P. Severino、André L. M. Porto
DOI:10.3390/molecules17088955
日期:——
The lipase B from Candida antarctica (Novozym 435®, CALB) efficiently catalyzed the kineticresolution of some aliphatic secondary alcohols: (±)-4-methylpentan-2-ol (1), (±)-5-methylhexan-2-ol (3), (±)-octan-2-ol (4), (±)-heptan-3-ol (5) and (±)-oct-1-en-3-ol (6). The lipase showed excellent enantioselectivities in the transesterifications of racemic aliphatic secondary alcohols producing the enantiopure