Densely Functionalized Chiral Pyrroles from Endocyclic, Exocyclic, and Acyclic Vinyl Sulfone-Modified Carbohydrates
摘要:
A wide range of vinyl sulfone-modified carbohydrates have been prepared as starting materials for the synthesis of polysubstituted chiral pyrroles. All these vinyl sulfones reacted efficiently with ethylisocyanoacetate to generate a plethora of new pyrrole derivatives. Furanosyl rings opened up during pyrrole synthesis, and pyranosyl rings were opened up by reacting the pyrrole with POCl3/DMF. This paper also reports one of the most efficient and practical routes for the synthesis of beta-substituted pyrroles.
Highly Diastereoselective Route to α-Glucosidase Inhibitors, Neosalacinol and Neoponkoranol
作者:Genzoh Tanabe、Youya Matsuda、Misato Oka、Yousuke Kunikata、Nozomi Tsutsui、Weija Xie、Gorre Balakishan、Mumen F. A. Amer、Shinsuke Marumoto、Osamu Muraoka
DOI:10.1021/acs.joc.5b02894
日期:2016.4.15
A facile and highly diastereoselectiveroute to potent natural α-glucosidase inhibitors, i.e., neosalacinol (4) and neoponkoranol (6), isolated from the traditional Ayurvedic medicine “Salacia” was developed by intramolecular cyclization of appropriately substituted sulfides (9 and 12).
Cyclic onium compounds reresented by the following structural formula (I), glucosidase inhibitors using such compounds, and antidiabetic drugs or food containing such glucosidase inhibitor.
wherein A
−
is an aniom; m is an interger between 1 and 6, n is 0 or 1, X
+
is S
+
or N
+
Q (where Q is H or an alkyl of 1 to 4 carbon atoms).
Facile synthesis of de-O-sulfated salacinols (3) was developed by employing the coupling reaction of an epoxide, 1,2-anhydro-3,4-di-O-benzyl-D-erythritol (9) with 2,3,5-tri-O-benzyl-1,4-dideoxy-1,4-epithio-D-arabinitol (10) as the key reaction. The reported structure of a potent alpha-glucosidase inhibitor named neosalacinol (8), isolated recently from Ayurvedic medicine Salacia oblonga, was proved incorrect, and revised to be de-O-sulfated salacinol formate (3c) by comparison of the spectroscopic properties with those of the authentic specimen synthesized. Discrepancies and confusion in the literature concerning the NMR spectroscopic properties of salacinol (1) have also been clarified. (C) 2009 Elsevier Ltd. All rights reserved.
SALACINOL AND PONKORANOL HOMOLOGUES, DERIVATIVES THEREOF, AND METHODS OF SYNTHESIZING SAME
申请人:Pinto Brian Mario
公开号:US20130109735A1
公开(公告)日:2013-05-02
Salacinol and ponkoranol homologues, derivatives thereof and methods of synthesizing and using said homologies and derivatives. The derivatives include stereoisomers, de-O-sulfonated compounds and congeners of the naturally occurring homologues. Some of the derivatives exhibit enhanced glucosidase inhibitory bioactivity in comparison to the naturally occurring compounds which have been isolated from
Salacia reticulata.