Titanium-mediated formation of 1,2-disubstituted cyclopropanols from esters and alkenes. A new approach to the synthesis of 3,11-dimethylnonacosan-2-one, a sex pheromone of the German cockroach

The Kulinkovich hydroxycyclopropanation reaction in natural product synthesis

The Kulinkovich cyclopropanation reaction provides a flexible and convenient method for the synthesis of cyclopropanols. Together with the diverse chemistry of the cyclopropanol unit, it offers access to a wide range of functionalised unsaturated and saturated compounds. The successful use in the synthesis of natural compounds is outlined in this perspective.

A pentenyl dianion-based strategy for convergent synthesis of ene-1,5-diols

A convergent two-step process is described for the synthesis of ene-1,5-diols that provides for union of two carbonyl electrophiles via a formal pentenyl dianion equivalent.

Diastereoselective titanium-mediated construction of cis-2,3-ring annelated 1-(2'-chloroethyl)cyclopropanols

Titanium(IV)-mediated cyclopropanation induced by reaction of cycloalkylmagnesium bromides 1a-e in the presence of titanium tetraisopropoxide with ethyl beta-chloropropionate 2 yielded cis-fused 1-(2'-chloroethyl)cyclopropanols 3b-e with diastereoselectivity highly depending on the ring size. Unexpected rearrangement products 5d,e were isolated in some cases.