Chiral Guanidinium Salt Catalyzed Enantioselective Phospha-Mannich Reactions
作者:Xiao Fu、Wei-Tian Loh、Yan Zhang、Tao Chen、Ting Ma、Hongjun Liu、Jianmin Wang、Choon-Hong Tan
DOI:10.1002/anie.200903971
日期:2009.9.21
Zero, one, or two? Guanidinium catalyst 1⋅HBArF4 (ArF=3,5‐(CF3)2C6H3, Bn=benzyl, Ts=4‐toluenesulfonyl) was obtained in a single step from a commercially available diamine. By using this catalyst an asymmetric phospha‐Mannich reaction has been developed, involving secondary phosphine oxides and H‐phosphinates as the P nucleophile. A series of enantiomerically enriched α‐amino phosphine oxides (2), α‐amino
Facile P,N-heterocycle synthesis via tandem aminomethylation–cyclization of H-phosphinate building blocks
作者:Clémence Queffélec、Jean-Luc Montchamp
DOI:10.1039/b917428a
日期:——
Various heterocycles containing phosphorus and nitrogen are easily synthesized from readily available H-phosphinate building blocks. Aminomethylation of these H-phosphinates is followed by in situ cyclization through substitution or cross-coupling to produce novel heterocycles in moderate to good yields.
Shown is the preparation and subsequent elaboration of P-chiral compounds that can be used as a building block for many P-chiral ligands used, for example, in asymmetric catalytic reactions. Specifically, a synthesis is shown for RP(O)(OR*)CH
2
OH, with R=H, Ph, aryl, alkyl, and R*=menthol (and other chiral alcohol-derived moieties), especially HP(O)(OMen)CH
2
OH (Men=L-menthol). This versatile building block is easily synthesized via reaction of inexpensive starting materials, H
3
PO
2
, menthol as the chiral auxiliary, and paraformaldehyde.
Temporary Protection of<i>H</i>-Phosphinic Acids as a Synthetic Strategy
作者:Laëtitia Coudray、Jean-Luc Montchamp
DOI:10.1002/ejoc.200900694
日期:2009.9
H-Phosphinates obtained through various methodologies are protected directly via reaction with triethyl orthoacetate. The resulting products can be manipulated easily, and various synthetic reactions are presented. For example, application to the synthesis of aspartate transcarbamoylase (ATCase) or kynureninase inhibitors are illustrated. Other reactions, such as Sharpless' asymmetric dihydroxylation
A General Strategy for the Synthesis of P-Stereogenic Compounds
作者:Olivier Berger、Jean-Luc Montchamp
DOI:10.1002/anie.201306628
日期:2013.10.18
A great leap forward toward the general synthesis of P‐stereogenic compounds: Heating H3PO2 with (−)‐menthol and paraformaldehyde gives easily crystallized menthyl hydroxymethyl‐H‐phosphinate (1). From this product, virtually any P‐stereogenic compound can be synthesized (see picture).
向P-立体异构化合物的一般合成方面迈出了一大步:将H 3 PO 2与(-)-薄荷醇和多聚甲醛加热可轻松结晶出羟甲基H-次膦酸薄荷基酯(1)。从该产品,几乎可以合成任何P立体异构化合物(参见图片)。