作者:Ruben Bartholomäus、Fabian Dommershausen、Markus Thiele、Narayan S. Karanjule、Klaus Harms、Ulrich Koert
DOI:10.1002/chem.201204545
日期:2013.6.3
A total synthesis of the proposed structures of fulicineroside and its aglycone fulicinerine is reported. The tetrasubstituted dibenzofuran substructure was accessible either through a Pd‐mediated ortho‐metalation or by an Ir‐catalyzed meta‐borylation. The synthesis of the β,β,α‐linked trisaccharide consisting of D‐olivose, L‐rhodinose, and L‐rhamnose was challenged by the unprecedented β‐linked rhodinose
报道了黄腐苷和其糖苷配基黄嘌呤碱的建议结构的全合成。四取代的二苯并呋喃亚结构可通过Pd介导的原金属化或通过Ir催化的间硼化来获得。由D-寡糖,L-罗丹糖和L-鼠李糖组成的β,β,α-连接的三糖的合成受到前所未有的β-连接的罗丹糖的挑战。Pd催化的4-表位-若丹糖的β-选择性糖基化反应和随后的Mitsunobu倒置可选择性地提供β-连接的L-若丹糖-L鼠李糖二糖。与天然产物和糖苷配基的报道数据进行比较表明,天然产物的结构分配有误。