Enantioselective Ring Opening of Aza and Oxabicyclic Alkenes with Dimethylzinc
作者:Mark Lautens、Sheldon Hiebert、Jean-Luc Renaud
DOI:10.1021/ol006052a
日期:2000.6.1
A system for efficient, asymmetric alkylative ringopening of azabenzonorbornadienes and [2.2.1] and [3.2.1] oxabicyclicalkenes was developed. The use of Pd(CH(3)CN)(2)Cl(2) and chiral phosphinooxazoline ligands gives the dihydronaphthalenes, cyclohexenols, and cycloheptenols in excellent yields and enantiomeric excesses.
The effect of remote oxygens on the ring-opening reactions of oxabicyclic compounds with organolithium reagents. Synthesis of the C21–C27 segment of rifamycin S
作者:Mark Lautens、Randolph K. Belter
DOI:10.1016/s0040-4039(00)79040-x
日期:1992.5
The reactivity of several related oxabicyclo[3.2.1]octenes toward ring-opening was found to depend on the stereochemistry of a remote hydroxyl group. It was also found that attenuation of the reactivity occurred upon protection of the remote alcohol.
Palladium-Catalyzed Enantioselective Alkylative Ring Opening
作者:Mark Lautens、Jean-Luc Renaud、Sheldon Hiebert
DOI:10.1021/ja993427i
日期:2000.3.1
Product of an SN2' Ring-Opening Reaction, (1R*,2R*,3R*,4R*,7R*)-2,4,7-Trimethylcyclohept-5-ene-1,3-diol
作者:J. Colucci、C. Gajda、M. Lautens、A. J. Lough
DOI:10.1107/s0108270194011194
日期:1995.5.15
The relative stereochemistry of the title compound, C10H18O2, has been confirmed. The geometry of the seven-membered ring indicates that it is strained. Molecules are linked by O-H ... O hydrogen bonds [O ... O 2.796(3) and 2.816(3)Angstrom] about independent ($) over bar 4 inversion sites to form infinite columns with two independent (... O-H ... O-H ...)(2) rings.
Opening of oxabicyclo[3.2.1]octenes with organolithium reagents. A route to cyclic and acyclic compounds with high stereocontrol