time, enantiomerically enriched atropoisomeric furans have been accessed using a central-to-axial chirality conversion strategy. Hence, oxidation of the enantioenriched dihydrofuran precursors gave rise to axially chiral furans with highenantiopurities accounting from excellent conversion percentages (cp) in most cases.
the dual electrophilic properties of (2-chloro-2-nitroethenyl)benzenes in a one-pot, formal [3+2] cycloaddition. Using a base (DBU), the desired trisubstituted heterocycles were formed rapidly (10–30 min) in good to excellent yields (51–92 %), and this versatile, metal-free methodology was applied to the synthesis of 2-acyl- and 2-carboalkoxyfurans and furan-2-carboxamides. Additionally, by using 2-ketophosphonate
Bidirectional enantioselective synthesis of bis-benzofuran atropisomeric oligoarenes featuring two distal C–C stereogenic axes
作者:Xiaoze Bao、Jean Rodriguez、Damien Bonne
DOI:10.1039/c9sc04378k
日期:——
bidirectional enantioselectivesynthesis of bis-benzofuran atropisomeric oligoarenes featuring two distal C–C stereogenic axes obtained by a two-fold central-to-axial chirality conversion upon oxidative aromatization. The key enantioenriched centrally chiral bis-dihydrobenzofuran precursors were synthesized via a bidirectional diastereo- and enantio-selective organocatalyzeddominoreaction between simple
A convenient procedure for the preparation of 5,6-dihydro-6-nitro-5-phenylfuro[2,3-d]pyrimidin-4(3H)-ones and 5-phenylfuro[2,3-d]pyrimidin-4(3H)-ones
作者:Daniel Dauzonne、Anne Adam-Launay
DOI:10.1016/s0040-4020(01)92249-5
日期:1992.4
Z-(2-chloro-2-nitroethenyl)benzenes with 4,6-dihydroxypyrimidine provides 5,6-dihydro-6-nitro-5-phenylfuro[2,3-d]pyrimidin-4(3H)-ones at room temperature. Involving the same starting materials, but using DBU in refluxing ethanol instead of triethylamine, the so far unknown 5-phenylfuro[2,3-d]pyrimidin-4(3H-ones are obtained
Z-(2-氯-2-硝基乙烯基)苯与4,6-二羟基嘧啶的三乙胺促进的缩合反应提供5,6-二氢-6-硝基-5-苯基呋喃[2,3-d]嘧啶-4(3 H)-在室温下一个。使用相同的起始原料,但在回流的乙醇中使用DBU代替三乙胺,获得了迄今未知的5-苯基呋喃[2,3-d]嘧啶-4(3 H -ones)
(2-chloro-2-nitroethenyl)benzenes as synthons: a general method for the preparation of 2,3-dihydro- 2-nitro-3-phenyl-4H-furo [3,2-c] [1]benzopyran-4-ones and 3-phenyl-4H-furo[3,2-c][1]benzopyran-4-ones