Hirotaka Osaki

[3,3]Sigmatropic ring expansion of cyclic thionocarbonates. 8. highly stereoselective synthesis of (Z- or (E)-double bonds by controlling chairlike-boatlike transition states in the [3,3]sigmatropic rearrangement of 8-membered thionocarbonates

Shinya Harusawa, Hirotaka Osaki, H. Fujii et al. · Tetrahedron · 1992 · 19 citations

8-Membered Thionocarbonates, Engineering, Cyclic Thionocarbonates +5

(3,3)Sigmatropic Ring Expansion of Cyclic Thionocarbonates. IV. Relationship between Ring Size of Cyclic Thionocarbonates and Geometry of Created Double Bond in Medium- and Large-Membered Thiolcarbonates.

Shinya Harusawa, Hirotaka Osaki, Toshiko Kurokawa et al. · Chemical and Pharmaceutical Bulletin · 1991 · 17 citations · Full text

Cyclic Thiolcarbonates, Double Bond Geometry, Engineering +13

2-Oxotetrahydro-1,3-oxazine: A Useful Interamediate for the Preparation of Tetrahydropyridine, Indolizidine, and Quinolizidine Skeletons

Takushi Kurihara, Y. Matsubara, Hirotaka Osaki et al. · Heterocycles · 1990 · 15 citations · Full text

Quinolizidine Alkaloids.we, Quinolizidine Skeletons, Engineering +14

[3,3]Sigmatropic ring expansion of cyclic thionocarbonates. 9. total synthesis of (±)-yellow scale pheromone via 10-membered thiolcarbonate

Shinya Harusawa, Shigetaka Takemura, Hirotaka Osaki et al. · Tetrahedron · 1993 · 13 citations

Engineering, Heterocyclic, Cyclic Thionocarbonates +7

Highly stereoselective synthesis of (Z)- or (E)-double bonds with conformational control in [3,3]sigmatropic ring expansion of 8-membered thionocarbonates

Shinya Harusawa, Hirotaka Osaki, H. Fujii et al. · Tetrahedron Letters · 1990 · 11 citations

Conformational Control, 8-Membered Thionocarbonates, Engineering +7