連続的炭素-炭素結合形成反応を機軸とする新規合成反応の開発研究

• 武田 敬

  広島大学大学院医歯薬学総合研究科

書誌事項

タイトル別名

• Development of New Synthetic Reactions Featuring Tandem Carbon-Carbon Bond Formation
• レンゾクテキ タンソ タンソ ケツゴウ ケイセイ ハンノウ オ キジクトスル シンキ ゴウセイ ハンノウ ノ カイハツ ケンキュウ

抄録

  Development of new synthetic reactions that feature a tandem process triggered by Brook rearrangement, a C-to-O 1,2-anionic shift of a silyl group, will be discussed. A basic motif for the strategy is the generation of an α-siloxy carbanion by the reaction of acylsilanes with ketone enolates and then trapping the anions by intra- and inter-molecular electrophiles. For example, the reaction of benzoyltrimethylsilane with lithium enolates of methyl ketones produced 1,2-cyclopropanediols via Brook rearrangement of the initial 1,2-adduct and subsequent internal aldol reaction. This concept was applied to the synthesis of five- and seven-membered carbocycles using the reaction of acryloylsilanes with enolates of alkyl and alkenyl methyl ketones, respectively. Furthermore, we found that the use of enolate of 2-cycloheptenone instead of the enolates of alkenyl methyl ketone as the four-carbon unit in the [3+4] annulation produces bicyclo[3.3.2]- decenone derivatives, in which the two-atom internal tether could be cleaved to give the cis-3,4,8-trisubstituted cyclooctenone enol silyl ethers stereoselectively. The α-siloxy carbanions can be also generated by an γ-anion-induced ring cleavage of α,β-epoxysilanes. Thus, O-silyl cyanohydrins of β-silyl-α,β-epoxyaldehyde can function as a highly functionalized homoenolate equivalent via a tandem sequence involving base-promoted ring opening, Brook rearrangement, and alkylation at the allylic position. Based on these results, we developed several new synthetically useful reactions in which three methods for the generation of a carbanion at the γ-position, i.e., deprotonation, reaction of acylsilanes with a nucleophile followed by Brook rearrangement, and a conjugate addition of a nucleophile to an enoate system bearing an epoxysilane moiety at the α-position, were used.<br>

収録刊行物

• 薬学雑誌

  薬学雑誌 127 (9), 1399-1418, 2007-09-01

  公益社団法人 日本薬学会

キーワード

• Brook rearrangement
• carbon-carbon bond formation
• tandem reactions
• rearrangement
• ring formation

詳細情報

• CRID: 1390001206129501312
• NII論文ID: 110006380724
• NII書誌ID: AN00284903
• DOI: 10.1248/yakushi.127.1399
• ISSN: 13475231
• ISSN: 00316903
• NDL書誌ID: 8937165
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I8937165
• Web Site: https://www.jstage.jst.go.jp/article/yakushi/127/9/127_9_1399/_pdf
• 本文言語コード: ja
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• 抄録ライセンスフラグ: 使用不可