designed and synthesized as alternative reagents to triphenylphosphine for the facile reduction of azides. The TPPc derivatives performed as efficient reducing agents for the synthesis of primary amines without the need for an additional hydrolysis procedure. The TPPc derivatives were also applied to nucleic acid sensing using a RhAz-oligonucleotide conjugate in a DNA-templated fluorogenic reaction.
PROCESSES FOR THE PREPARATION OF DIASTEREOMERICALLY AND ENANTIOMERICALLY ENRICHED OXAZOLINES
申请人:Quimica Sintetica, S.A.
公开号:EP3168208A1
公开(公告)日:2017-05-17
The invention relates to an industrially viable and advantageous process for the preparation of (2S,3R)-2-amino-3-(3,4-dihydroxyphenyl)-3-hydroxypropanoic acid, having the following formula:
generally known as Droxidopa, or of intermediates useful in the synthesis thereof.
[EN] ASYMMETRIC SYNTHESIS OF ALLYL OR ALLENE OXINDOLES<br/>[FR] SYNTHÈSE ASYMÉTRIQUE D'OXINDOLES D'ALLYLE OU D'ALLÈNE
申请人:UNIV PENNSYLVANIA
公开号:WO2010008727A1
公开(公告)日:2010-01-21
The invention concerns processes for the preparation of a compound of the formula I comprising contacting a compound of formula II with a catalyst, said catalyst comprises (i) at least one of Pd and Cu and (ii) one or more of diamine, diphosphine and aminophosphine ligands; wherein Z is -C(R5)(R6)-C(R2)=C(R3)(R4) and Y is -C(R3)(R4)-C(R2)=C(R5)(R6) or Z is -C(R5)(R6)-C≡C-R3; Y is or -C(R3)=C=C(R5)(R6); X is NH, NR15, O or S; a is O or an integer from 1 to 4 and R1 -R7 and R15 are as defined in the specification.
Phosphine-catalysed intermolecular cyclopropanation reaction between benzyl bromides and activated alkenes
While phosphine-mediated reactions have been extensively explored over the past few decades, the catalytic cyclopropanation reaction via a phosphonium ylide pathway has been significantly underdeveloped, and an intermolecular version still remains to be disclosed. Presented herein is a catalytic cyclopropanation reaction between readily available benzylbromides and activated alkenes, such as α-cyano