Direct Synthesis of <i>B</i>-Allyl and <i>B</i>-Allenyldiisopinocampheylborane Reagents Using Allyl or Propargyl Halides and Indium Metal Under Barbier-Type Conditions
作者:Lacie C. Hirayama、Terra D. Haddad、Allen G. Oliver、Bakthan Singaram
DOI:10.1021/jo300260a
日期:2012.5.4
groups to aldehydes and ketonesusing B-chlorodiisopinocampheylborane (dDIP-Cl) and indium metal. Under Barbier-type conditions, indium metal was used to generate allyl- and allenylindium intermediates, and subsequent reaction with dDIP-Cl successfully promoted the transfer of these groups to boron forming the corresponding chiralboranereagents. The newly formed boranereagents were reacted with aldehydes
Catalytic, Regioselective Hydrocarbofunctionalization of Unactivated Alkenes Triggered by <i>trans</i>-Acetoxypalladation of Alkynes
作者:Rahul K. Shukla、Atul K. Chaturvedi、Subir Pal、Chandra M. R. Volla
DOI:10.1021/acs.orglett.1c00118
日期:2021.2.19
Herein we demonstrate a Pd(II)-catalyzed regioselective hydrocarbofunctionalization of unactivatedalkenes. The σ-vinyl-palladium(II) intermediate generated by the trans-acetoxypalladation of alkynes was added across carbon–carbon double bond to realize an efficient hydroalkenylation protocol. Bidentate auxiliary 8-aminoquinoline controls the regioselectivity of the carbopalladation step and thereby
Regioselective Propargylation of Aldehydes and Ketones by Electrochemical Reaction using Zinc and Aluminum Anodes
作者:Nobuhito Kurono、Kazuya Sugita、Masao Tokuda
DOI:10.1016/s0040-4020(99)01089-3
日期:2000.2
Electrochemical propargylation of aldehydes and ketones with unsubstituted or α-substituted propargylic bromides using platinum cathode and zinc anode proceeded efficiently under mild conditions to give the corresponding homopropargyl alcohols exclusively in high yields. Similar electrochemical propargylation with γ-substituted propargyl bromides gave the corresponding homoallenyl alcohols as major
Scalable Regioselective and Stereoselective Synthesis of Functionalized (<i>E</i>)-4-Iodobut-3-en-1-ols: Gram-Scale Total Synthesis of Fungal Decanolides and Derivatives
作者:Alexander M. Sherwood、Samuel E. Williamson、Stephanie N. Johnson、Anil Yilmaz、Victor W. Day、Thomas E. Prisinzano
DOI:10.1021/acs.joc.7b02324
日期:2018.1.19
A reliable protocol to synthesize both racemic and chiral (E)-4-iodobut-3-en-1-ols from aldehydes or epoxides, respectively, containing various aromatic and aliphatic substitutions has been established. The utility of these compounds was then demonstrated by providing access to known fungal decanolides as well as novel aromatic macrocycles. The protocol provided a gram-scale route to (−)-aspinolide
Stereoselective synthesis of C-fused pyranoindoles, pyranobenzofurans and pyranobenzothiophene scaffolds using oxa-Pictet–Spengler type reaction of vinylogous carbonates
作者:Santosh J. Gharpure、V. Prasath
DOI:10.1039/c4ob01387e
日期:——
C-fused pyranoheterocycles can be assembled in a highly diastereoselective manner using an intramolecular oxa-Pictet–Spengler type reaction of vinylogous carbonates.