Floeistrup, Erik et al. published their research in Tetrahedron Letters in 2011 | CAS: 90560-10-4

6-Methoxybenzo[b]thiophene (cas: 90560-10-4) belongs to benzothiophene derivatives. Benzothiophene is relatively a stable molecule. The electrophilic substitution of benzothiophene systems is much less regioselective than that of indoles. It has been used as a raw material for the synthesis of biologically active structures and is found in pharmaceuticals such as leukotriene synthesis inhibitors and antifungals, as well as in many natural products.Reference of 90560-10-4

Synthesis of estradiol backbone mimics via the Stille reaction using copper(II) oxide as co-reagent was written by Floeistrup, Erik;Goede, Patrick;Stroemberg, Roger;Malm, Johan. And the article was included in Tetrahedron Letters in 2011.Reference of 90560-10-4 This article mentions the following:

Sterically hindered 2-phenylbenzo[b]thiophenes I (R1 = H, HO; R2 = H, Me; R3 = H, Me) and biaryls II (R4 = HO, PhCH2O; R5 = CHO) that can serve as templates for mimics of the estradiol backbone were prepared in modest to good yields by the Stille reaction using CuO as a coreagent. Due to the neutral conditions applied in the Stille reaction, protection strategies were unnecessary for hydroxy containing coupling partners. Ligandless coupling conditions were also evaluated. In the experiment, the researchers used many compounds, for example, 6-Methoxybenzo[b]thiophene (cas: 90560-10-4Reference of 90560-10-4).

6-Methoxybenzo[b]thiophene (cas: 90560-10-4) belongs to benzothiophene derivatives. Benzothiophene is relatively a stable molecule. The electrophilic substitution of benzothiophene systems is much less regioselective than that of indoles. It has been used as a raw material for the synthesis of biologically active structures and is found in pharmaceuticals such as leukotriene synthesis inhibitors and antifungals, as well as in many natural products.Reference of 90560-10-4

Referemce:
Benzothiophene – Wikipedia,
Benzothiophene | C8H6S – PubChem