Construction of ring systems containing the gemdimethylcyclopropane unit using diphenylsulfonium isopropylide

Ylide character and stability of heterocyclic benzenes

“…This more thorough study of the phosphorus ylide is primarily due to its greater stability in solution, its greater ease of preparation, and its greater synthetic utility (the Wittig reagent) compared to the same characteristics of trimethylammonium methylide [9]. Although phosphorus ylides are used widely, interest into the applications of sulfur ylides to synthetic problems has been stimulated by the work of Corey and Jautelat [10]. Sulfur ylides is generally performed α -β elimination, Stevens rearrangement, and 2,3-sigmatropic rearrangement [11].…”

Short Access to the Aromadendrane Family: Highly Efficient Stereocontrolled Total Synthesis of (±)‐Cyclocolorenone and (±)‐α‐Gurjunene

“…Our attention was turned then to a Michael addition/intramolecular substitution sequence of the sulfur ylide. Applying the conditions outlined by Corey [16] (LDA, CH 2 Cl 2 /DME, -78Ǟ-50°C) to 7 led only to products of degradation. We reasoned that this failure was due to the ability of 7 to be readily enolized.…”

Cobalt‐Catalyzed Reductive Dimethylcyclopropanation of 1,3‐Dienes

“…[9] Additionally, the Corey–Chaykovsky-type dimethylcyclopropanation of α,β-unsaturated carbonyl compounds has been developed. [10] …”