Enantioselective synthesis of the dimeric pyranonaphthoquinone core of the cardinalins using a late-stage homocoupling strategy
作者:Jonathan Sperry、Jennifer S. Gibson、Jimmy J. P. Sejberg、Margaret A. Brimble
DOI:10.1039/b813605j
日期:——
The enantioselective synthesis of a dimeric pyranonaphthoquinone closely related to the cardinalins is described. Whilst attempts to effect a double Hauser-Kraus annulation of enone 5 were unsuccessful using both bis-phthalide 4 and bis-sulfone 21, a single annulation of cyanophthalide 28 with enone 5 furnished functionalised naphthalene 31. Suzuki-Miyaura homocoupling of the aryl triflate 29 derived
The enantioselective synthesis of a dimeric pyranonaphthoquinone closely related to cardinalin 3 is described. Key steps include the Hauser-Kraus annulation between a cyanophthalide and a chiral enone to create the naphthalene skeleton, a Suzuki-Miyaura homocoupling of an aryl triflate to construct the biaryl bond and a double stereoselective lactol reduction to install the 1,3-cis stereochemistry of the pyran rings.