122406-57-9

Upstream product

• 1120-73-6 2-methyl-2-cyclopenten-1-one 
• 17668-60-9 trans-crotyldiphenylphosphine oxide 
• 120454-08-2 (E)-1-(tert-butylsulfonyl)-5-(1',3'-dioxan-2'-yl)pent-1-en-3-one 
• 122406-51-3 (1'RS,1''E,2SR,2'E,3SR)-2-<5''-(1''',3'''-dioxan-2'''-yl)-3''-oxopent-1''-enyl>-3-<3'-(diphenylphosphinoyl)-1'-methylprop-2'-enyl>-2-methylcyclopentanone 
• 122334-20-7 (2RS,2'RS,3RS)-2-<5''-(1''',3'''-dioxan-2'''-yl)-3''-oxopentyl>-3-<3'-(diphenylphosphinoyl)-1'-methylpropyl>-2-methylcyclopentanone 
• 122334-21-8 (1RS,1'RS,7aRS)-4-<(1''',3'''-dioxan-2'''-yl)methyl>-1-<3'-(diphenylphosphinoyl)-1'-methylpropyl>-7a-methyl-1,2,3,6,7,7a-hexahydro-5H-inden-5-one 
• 108643-98-7 (E)-5-(1',3'-dioxan-2'-yl)-1-(phenylsulfonyl)pent-1-en-3-one 
• 108662-09-5 (Z)-5-(1',3'-dioxan-2'-yl)-1-(phenylsulfonyl)pent-1-en-3-one 

Relevant academic research and scientific papers

Use of β-Sulfonyl Vinyl Ketones as Equivalents to Vinyl Ketones in Robinson Annelation. Convergent, Highly Stereoselective Preparation of a Hydrindanol Related to Vitamin D from 2-Methylcyclopent-2-enone and Lithiated (E)-But-2-enyldiphenylphosphine Oxide

Conjugate addition of lithiated (E)-but-2-enyldiphenylphosphine oxide (3) to 2-methylcyclopent-2-enone (2) in tetrahydrofuran at -20 deg C generates the enolate 8, which reacts rapidly with a series of β-sulfonyl vinyl ketones to generate unsaturated dike