We herein report a transition-metal-free cross-coupling between secondaryalkylhalides/mesylates and aryl/alkenylboronic acid, providing expedited access to a series of nonchiral/chiral coupling products in moderate to good yields. Stereospecific SN2-type coupling is developed for the first time with alkenylboronic acids as pure nucleophiles, offering an attractive alternative to the stereospecific
A Prins bicyclization strategy for the stereoselectivesynthesis of trans-fused hexahydropyrano[3,4-c]chromene derivatives in good to excellent yields has been developed. The synthetic versatility of this approach has been demonstrated in the synthesis of calyxinI and J analogues. This is the first example of the synthesis of hexahydropyrano[3,4-c]chromene derivatives from (E)-3-[2-(benzyloxy)phe
Intramolecular Etherification and Polyene Cyclization of π-Activated Alcohols Promoted by Hot Water
作者:Feng-Zhi Zhang、Yan Tian、Guo-Xing Li、Jin Qu
DOI:10.1021/jo502636d
日期:2015.1.16
Hot water, acting as a mildly acidic catalyst, efficientlypromoted intramolecular direct nucleophilic substitution reactions of unsaturatedalcohols with heteroatom or carbon nucleophiles. In a mixed solvent of water and 1,1,1,3,3,3-hexafluoro-2-propanol (HFIP), polyene cyclizations using allylic alcohols as initiators gave the desired cyclized products, and in neat HFIP, a tricyclization reaction
Synthesis of Substituted Benzoxacycles via a Pd(II)-Catalyzed Intramolecular Arylation Reaction of Allylic Alcohols
作者:Jingjie Li、Ceheng Tan、Xinpeng Mu、Jianxian Gong、Zhen Yang
DOI:10.1002/cjoc.201600527
日期:2017.5
Herein a Pd‐catalyzed intramolecular allylation reaction of unprotected allylic alcohols was developed, and the reaction proceeded through a Pd(II)‐mediated allylic carbocation species formation, followed by a Friedel‐Crafts type annulation to afford functionalized chromanes.