Ureidopeptide‐Based Brønsted Bases: Design, Synthesis and Application to the Catalytic Enantioselective Synthesis of β‐Amino Nitriles from (Arylsulfonyl)acetonitriles
作者:Saioa Diosdado、Rosa López、Claudio Palomo
DOI:10.1002/chem.201304877
日期:2014.5.19
preparation of β‐aminonitriles. We present a highly efficient organocatalytic methodology for the stereoselective synthesis of β‐aminonitriles, in which the key to success is the use of ureidopeptide‐basedBrønstedbase catalysts in combination with (arylsulfonyl)acetonitriles as synthetic equivalents of the acetonitrile anion. The method gives access to a variety of β‐aminonitriles with good yields
Highly enantio- and chemo-selective 1,4-conjugate addition process of 5H-thiazol-4-ones with maleimides or 1,4-naphthoquinones, and 5H-oxazol-4-ones with maleimides were performed under a dipeptide-based tertiary amine (DP-UAA) catalyst. A series of valuable N,S- and N,O-containing heterocyclic compounds with excellent enantio- and disastereo-selectivities (up to >99% ee, > 20:1 dr) were attained.
Highly chemo-, enantio-, and diastereoselective [4 + 2] cycloaddition of 5<i>H</i>-thiazol-4-ones with <i>N</i>-itaconimides
作者:Shuai Qiu、Choon-Hong Tan、Zhiyong Jiang
DOI:10.3762/bjoc.12.222
日期:——
A dipeptide-based urea-amide tertiary amine (DP-UAA) was shown to be an effective Brønsted base catalyst for the first asymmetric annulation reaction between 5H-thiazol-4-ones and N-itaconimides. High levels of enantioselectivity (up to 99% ee) and diastereoselectivity (>19:1 dr) were obtained for a series of spirocyclic 1,4-sulfur-bridged piperidinone-based succinimides.