Asymmetric Catalysis on the Intramolecular Cyclopropanation of α-Diazo-β-keto Sulfones.
✍ Scribed by Masahiro Honma; Takashi Sawada; Yuri Fujisawa; Masayuki Utsugi; Hideaki Watanabe; Akinori Umino; Takehiko Matsumura; Takayuki Hagihara; Masashi Takano; Masahisa Nakada
- Publisher
- John Wiley and Sons
- Year
- 2003
- Weight
- 194 KB
- Volume
- 34
- Category
- Article
- ISSN
- 0931-7597
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## Abstract We have examined the catalytic asymmetric intramolecular cyclopropanation (IMCP) reactions of 5‐aryl‐1‐diazo‐1‐mesitylsulfonyl‐5‐hexen‐2‐ones, and found that the substituent of the 5‐aryl group dramatically changes the enantioselectivity. That is, no enantioselectivity was observed when
## Abstract Chemoselective cross‐metathesis of unsaturated α‐diazo‐β‐keto esters using Grubbs’ 2^nd^ generation catalyst, followed by Rh~2~(OAc)~4~‐catalysed tandem carbonyl ylide formation‐intramolecular cycloaddition is demonstrated. The two different catalytic metallocarbene transfer reactions h