Novel 13,14-dihydroprostaglandin derivatives of the formula ##STR1## wherein: m is 1 or 3; R.sub.1 is hydrogen or alkyl; R.sub.2 is hydrogen or lower alkyl; R.sub.3 and R.sub.4 are independently hydrogen or methyl; R.sub.5 is alkyl, CF.sub.3 (CH.sub.2).sub.n -- in which n is an integer of 3-5, cycloalkyl, or optionally substituted phenyl, benzyl or phenoxy; or R.sub.4 and R.sub.5 taken together with the carbon to which they are attached is cycloalkyl of 4-8 carbon atoms; X is cis --CH.dbd.CH-- or --CH.sub.2 CH.sub.2 -- when m is 3, or X is --CH.sub.2 CH.dbd.C.dbd.CH-- when m is 1; and the wavy lines represent the .alpha. or .beta. configuration with the proviso that when one wavy line is .alpha. the other is .beta.; or a pharmaceutically acceptable salt thereof, have been prepared. They are useful in particular for their antihypertensive and anti-ulcerogenic properties.
Synthesis of enantiomerically enriched secondary and tertiary phenylthio- and phenoxy-aldols
作者:Angela M. Bernard、Angelo Frongia、Pier Paolo Piras、Francesco Secci、Marco Spiga
DOI:10.1016/j.tetlet.2008.03.066
日期:2008.5
donors and acceptors in organocatalytic aldol reactions. Our studies have revealed effective methodologies for accessing structurally varied and enantiomerically enriched secondary and tertiary phenylthio- and phenoxy-aldols, expanding the scope and potential synthetic utility of organocatalytic direct aldol reactions.
Sulfone Group as a Versatile and Removable Directing Group for Asymmetric Transfer Hydrogenation of Ketones
作者:Vijyesh K. Vyas、Guy J. Clarkson、Martin Wills
DOI:10.1002/anie.202004658
日期:2020.8.17
The sulfone functional group has a strong capacity to direct the asymmetrictransferhydrogenation (ATH) of ketones in the presence of [(arene)Ru(TsDPEN)H] complexes by adopting a position distal to the η6‐arene ring. This preference provides a means for the prediction of the sense of asymmetric reduction. The sulfone group also facilitates the formation of a range of reduction substrates, and its