Z-allylsilanes 1 are epoxidized by V5+/TBHP with high erythro-selectivity (up to 97:3) . HF- or TBAF-induced fragmentation leads to syn-1,3-diols 3. Compound 3f can be transformed within two steps into a key synthon for the lactone moiety of compactin.
Z-allylsilanes 1 are epoxidized by V5+/TBHP with high erythro-selectivity (up to 97:3) . HF- or TBAF-induced fragmentation leads to syn-1,3-diols 3. Compound 3f can be transformed within two steps into a key synthon for the lactone moiety of compactin.
Stereoselective approach to trisubstituted tetrahydrofurans
作者:Peter Mohr
DOI:10.1016/s0040-4039(00)73723-3
日期:1993.9
Functionalized allylsilanes 1 undergo with acetals 2 under mild Broensted acid catalysis a transacetalization-ring closure reaction to afford in fair to good yield and high diastereoselectivity all-cis-tetrahydrofurans 3. The stereochemical outcome is independent of the double bond geometry.
Hydroxyl-directed cyclopropanation of Z-allyl-silanes
作者:Peter Mohr
DOI:10.1016/0040-4039(95)01490-9
日期:1995.10
Z-5-Hydroxy-alk-2-enyl-silanes of general structure 1 are cyclopropanated by an excess of CH2I2/Et(2)n in good yield and excellent stereoselectivity. Ensuing protodesilylation, however, lacks efficient regiocontrol and affords syn-products 5 in modest yield bur high stereochemical purity.
Stereoselective synthesis of syn-1,3-diols
作者:Peter Mohr
DOI:10.1016/s0040-4039(00)92213-5
日期:1992.4
Z-allylsilanes 1 are epoxidized by V5+/TBHP with high erythro-selectivity (up to 97:3) . HF- or TBAF-induced fragmentation leads to syn-1,3-diols 3. Compound 3f can be transformed within two steps into a key synthon for the lactone moiety of compactin.