<span style="font-size:19.0pt;mso-bidi-font-size:12.0pt; font-family:"Times New Roman";mso-fareast-font-family:"Times New Roman"; mso-ansi-language:EN-US;mso-fareast-language:EN-US;mso-bidi-language:AR-SA">Synthesis of 8-(3'-butenyl)-9,9-dimethyl-2- oxaspiro[4.4]non-7 -en-1-one, an advanced intermediate for terpenes of the marine sponge <i><span style="font-size:19.5pt; mso-bidi-font-size:12.5pt;font-family:"Times New Roman";mso-fareast-font-family: "Times New Roman";mso-ansi-language:EN-US;mso-fareast-language:EN-US; mso-bidi-language:AR-SA">Dysidea herbacea</span></i></span>

Abstract

511-514A short synthesis of the spirolactone 6 has been achieved for the total synthesis of the nor-sesquiterpene herbasolide <b style="mso-bidi-font-weight: normal">1 and other structurally related sesquiterpenes of the marine sponge Dysidea herbacea.</span