An economical and convenient preparation of 2-(phenylthio)cyclobutanone, a synthetic equivalent of cyclobutanone
โ Scribed by Theodore Cohen; Daniel Ouellette; K. Pushpananda; A. Senaratne; Lin-Chen Yu
- Publisher
- Elsevier Science
- Year
- 1981
- Tongue
- French
- Weight
- 249 KB
- Volume
- 22
- Category
- Article
- ISSN
- 0040-4039
No coin nor oath required. For personal study only.
โฆ Synopsis
A practical procedure is given for the preparation of 2-(phenylthio)cyclobutanone ( 2) and the use of the latter as a convenient substitute for cyclobutanone is demonstrated.
We recently reported a new ring-forming reaction resulting in the production of 1,2-bis-(phenylthio)cyclobutene
(1, and a corresponding cyclopentene by an unconventional methyllithiuminduced 1,4-and 1,5-elimination, respectively, H NMR, IR, and mass spectroscopy. Elemental compositions were determined for new compounds by combustion analysis or exact mass determination (
๐ SIMILAR VOLUMES
Hydroxy-1-phenylthio-2-alkynes (5) reacted with dihydropyran to afford the corresponding 4-tetrahydropyranyloxy derivatives which, on treatment with KHMDS, gave a mixture of (E)-and (Z)-1-phenylthio-3-alken-1-ynes, with the former predominant. When MeLi was used in the place of KHMDS, the (Z)-isomer
3-Bromo-2-pyrone, a stable solid prepared by a new route (eq. l), has been found to undergo smooth and regiospecific 2+4-cycloadditions between 78-90ยฐC with both electron-n& and electron-deficient dienophtles; subsequent high-yield reductive debrominattons produced halogen-free cycloadducts thus sho